Yes he was, he commented on it in the original video, which the GN video included.

maybe I'm blind deaf and stupid but the link for that say nothing about Linus knowing about the 4090 FE edition of the cooler. Just that they used a 4090 in the original video and that was bad, which I again agree with and said he probably should have used a 3090TI.

My bad, I should not have quoted a word that they didn't use directly. But still, his final conclusion, as included in the GN video, is that nobody should buy it, and not just because of cost.

Because its a 800+ dollar of copper for a gpu and cpu cooling. Even if it was 20 degrees lower, you are spending half of what you spent on a fucking GPU on copper (that is magnificently manufactured/milled). This is so niche its just a bad product since the tolerances are so tight as shown in the video it only works on one type of gpu and/or cpu. Like its clear Billet labs is doing fantastic work on the machining but no reasonable consumer should ever buy this. This is so unreasonable and that is the point Linus is making. Its a cool project that Billet labs is making but there is almost no practical purpose for it.

Edit: Like their business model is so niche. If anything this feels like a way to spin the company in the direction of making custom milled part for commercial entities that need custom solutions. The consumer market isn't a good market for them.